What are you outputting from? A capture card like AJA, Blackmagic Design, etc?
If you have the HDW-1800 set to lock to external reference, then you need the proper reference setting on the output card or have the same flavor of reference feeding the card that you are outputting from to the deck when editing to tape. Otherwise, the deck is going to freak out like this.
Senior Broadcast Videotape Operator
TeleVersions, LLC - Chicago